/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* vi: set ts=8 sw=8 sts=8: */
/*************************************************************************/ /*!
@File
@Title          PowerVR DRM PCI driver
@Codingstyle    LinuxKernel
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@License        MIT

The contents of this file are subject to the MIT license as set out below.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

This License is also included in this distribution in the file called
"MIT-COPYING".

EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/ /**************************************************************************/

#include <drm/drmP.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/version.h>

#include "module_common.h"
#include "pvr_drv.h"
#include "pvrmodule.h"
#include "sysinfo.h"

static struct drm_driver pvr_drm_pci_driver;

static int pvr_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
	struct drm_device *ddev;
	int ret;

	DRM_DEBUG_DRIVER("device %p\n", &pdev->dev);

	ddev = drm_dev_alloc(&pvr_drm_pci_driver, &pdev->dev);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
	if (IS_ERR(ddev))
		return PTR_ERR(ddev);
#else
	if (!ddev)
		return -ENOMEM;
#endif

	ret = pci_enable_device(pdev);
	if (ret)
		goto err_drm_dev_unref;

	ddev->pdev = pdev;

	/*
	 * drm_get_pci_dev calls sets the drvdata at this point, to ddev.
	 * We set the drvdata in the load callback, so there is no need
	 * to do it again here. The platform driver equivalent of
	 * drm_get_pci_dev, drm_platform_init, doesn't set the drvdata,
	 * which is why it is done in the load callback.
	 *
	 * The load callback, called from drm_dev_register, is deprecated,
	 * because of potential race conditions. Calling the function here,
	 * before calling drm_dev_register, avoids those potential races.
	 */
	BUG_ON(pvr_drm_pci_driver.load != NULL);
	ret = pvr_drm_load(ddev, 0);
	if (ret)
		goto err_pci_dev_disable;

	ret = drm_dev_register(ddev, 0);
	if (ret)
		goto err_drm_dev_unload;

#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0))
	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
		pvr_drm_pci_driver.name,
		pvr_drm_pci_driver.major,
		pvr_drm_pci_driver.minor,
		pvr_drm_pci_driver.patchlevel,
		pvr_drm_pci_driver.date,
		pci_name(pdev),
		ddev->primary->index);
#endif
	return 0;

err_drm_dev_unload:
	pvr_drm_unload(ddev);
err_pci_dev_disable:
	pci_disable_device(pdev);
err_drm_dev_unref:
	drm_dev_unref(ddev);
	return ret;
#else
	DRM_DEBUG_DRIVER("device %p\n", &pdev->dev);

	return drm_get_pci_dev(pdev, ent, &pvr_drm_pci_driver);
#endif
}

static void pvr_remove(struct pci_dev *pdev)
{
	struct drm_device *ddev = pci_get_drvdata(pdev);

	DRM_DEBUG_DRIVER("device %p\n", &pdev->dev);

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
	drm_dev_unregister(ddev);

	/* The unload callback, called from drm_dev_unregister, is
	 * deprecated. Call the unload function directly.
	 */
	BUG_ON(pvr_drm_pci_driver.unload != NULL);
	pvr_drm_unload(ddev);

	pci_disable_device(pdev);

	drm_dev_unref(ddev);
#else
	drm_put_dev(ddev);
#endif
}

static void pvr_shutdown(struct pci_dev *pdev)
{
	struct drm_device *ddev = pci_get_drvdata(pdev);
	struct pvr_drm_private *priv = ddev->dev_private;

	DRM_DEBUG_DRIVER("device %p\n", &pdev->dev);

	PVRSRVCommonDeviceShutdown(priv->dev_node);
}

static const struct pci_device_id pvr_pci_ids[] = {
	{ PCI_DEVICE(SYS_RGX_DEV_VENDOR_ID, SYS_RGX_DEV_DEVICE_ID) },
#if defined(SYS_RGX_DEV1_DEVICE_ID)
	{ PCI_DEVICE(SYS_RGX_DEV_VENDOR_ID, SYS_RGX_DEV1_DEVICE_ID) },
#endif
	{ 0 }
};

MODULE_DEVICE_TABLE(pci, pvr_pci_ids);

static struct pci_driver pvr_pci_driver = {
	.name		= DRVNAME,
	.driver.pm	= &pvr_pm_ops,
	.id_table	= pvr_pci_ids,
	.probe		= pvr_probe,
	.remove		= pvr_remove,
	.shutdown	= pvr_shutdown,
};

static int __init pvr_init(void)
{
	int err;

	DRM_DEBUG_DRIVER("\n");

	pvr_drm_pci_driver = pvr_drm_generic_driver;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0) && \
	LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0))
	pvr_drm_pci_driver.set_busid = drm_pci_set_busid;
#endif

	err = PVRSRVCommonDriverInit();
	if (err)
		return err;

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
	return pci_register_driver(&pvr_pci_driver);
#else
	return drm_pci_init(&pvr_drm_pci_driver, &pvr_pci_driver);
#endif
}

static void __exit pvr_exit(void)
{
	DRM_DEBUG_DRIVER("\n");

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
	pci_unregister_driver(&pvr_pci_driver);
#else
	drm_pci_exit(&pvr_drm_pci_driver, &pvr_pci_driver);
#endif
	PVRSRVCommonDriverDeinit();

	DRM_DEBUG_DRIVER("done\n");
}

module_init(pvr_init);
module_exit(pvr_exit);